/Engine/Source/Editor/Kismet/Public/BlueprintEditor.h
Perform the actual promote to variable action on the given pin in the given blueprint.
void DoPromoteToVariable ( [UBlueprint](API\Runtime\Engine\Engine\UBlueprint) * InBlueprint, [UEdGraphPin](API\Runtime\Engine\EdGraph\UEdGraphPin) * InTargetPin, bool bInToMemberVariable, const FVector2D * InOptionalLocation )